Natural Gas Utility Supply
Natural Gas Utility Supply
(OP)
Hello,
Could ypu please explain to me what a Letdown Station is and does it function?This is in regards with a natural gas utility supply.
Kindly Regards,
One Point
Could ypu please explain to me what a Letdown Station is and does it function?This is in regards with a natural gas utility supply.
Kindly Regards,
One Point





RE: Natural Gas Utility Supply
natural gas "pressure reducing station"
RE: Natural Gas Utility Supply
RE: Natural Gas Utility Supply
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: Natural Gas Utility Supply
RE: Natural Gas Utility Supply
RE: Natural Gas Utility Supply
RE: Natural Gas Utility Supply
Come on! Code changes, insurance requirements, transmission or LDC, DOT, ASME, meter station, custody transfer points, has nothing to do with the term "letdown". We have pleanty of letdowns where we let the pressure down into our own facilities and there's no code change, its all B31.8, or Title 49 Part 142, if you prefer, for gas or B31.4, etc. for liquid, both on the pipeline and inside the stations. How do you explain that? You mean I should believe that ya'll say, "I think this is where I'll make a code "letdown".
Don't try to sell it here.
Google It! the first 3 references that come up are,
1. "Automatic pressure letdown,"
2. "Flashtubes for pressure letdown"
3. "clean power from pressure letdown "
4. "Slurry-Phase High-Pressure Let-Down"
5. "Dynamic Slurry Pressure Let Down Device"
6. "Yarway, Control Valves
It combines the functions of a check valve, flow sensing device, minimum flow control and pressure letdown into a single valve. ..."
7. " fabrication methods, system plugging, pressure letdown, "
8. "eg, during pressure letdown or during"
9. "pressure letdown lines in the CVCS. ..."
10. "[PDF] Natural Gas Liquefaction
File Format: PDF/Adobe Acrobat - View as HTML
Pressure let-down liquefier– (Sacramento Plant) Utilizes pressure drop between. transmission lines and distribution lines to liquefy 10% of gas flow ..."
11. "ProSciTech: Page K3: K3: Critical Point Dryers & Freeze Dryers
Fine Control Needle Valve Pressure Letdown (Flow Gauge Monitor OPTION.) Illuminated Chamber with Side Viewing Port and Protective ‘Lexan’ Shield. ..."
12. "[PDF] Flow Control Before installation these instructions must be fully ...
File Format: PDF/Adobe Acrobat
flow and provide pressure letdown. Operation. Flow through the check valve overcomes. the spring force to open the main check. valve element. ...
www.
13. "PDF] ExxonMobil High-Pressure Process Technology for LDPE
File Format: PDF/Adobe Acrobat
"the low-pressure letdown valve and fed to the low-pressure. separator. At this point, most of the remaining entrained ethyl- ..."
Strange not one mentioned a code change, farm taps, DOT, ASME or ...anything else you said.
If that's what Google and ExxonMobil says it is, its good enough for me. Sorry, I'm sticking with my definition.
RE: Natural Gas Utility Supply
It is also trivially true that a pressure breakdown station is a pressure breakdown station, but that does not preclude that it can also be a scope break or a code break etc.
Most of the design codes I have seen that apply to fuel gas piping systems make a distinction between high pressure distribution ( above about 60 psig) and low pressure consumer piping ( below about 60 psig), and the types of safety systems, inspections, etc vary considerably between these 2 different pressure classes.
RE: Natural Gas Utility Supply
I think the idea of trying to define a particular term should be more something like actually getting closer to an exact definition in each suquential post, rather than writing a more inclusive, broader and broader definition that gets so far away from the original meaning and winds up so large in scope that finally it includes every place you can point to on a pipeline or in a power station such that it is no longer relavent to original question asked, is not what we should be trying to do here. I mean like, following your logic where I think you say you are technically correct because, a letdown might or "can also be" or include something else, just doesn't make sense. To give you an example: your letdown can also be ... an airplane, as we can probably presume there is a pressure letdown somewhere in a 747's hydraulic system. A little bit over the top, would you not agree? Can we leave it?
RE: Natural Gas Utility Supply
I think it's great to point out to someone who doesn't even know what a "Letdown STATION" is that it could mean precisely that or more than that.
And all the googling in the world be damned.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com